0-62 relates only in that way if you think its appropriate use that to tell car is fast rather than top speed. I think the top speed gives better impression about what kind of car the lupo actually is.
Drag equation - Wikipedia, the free encyclopedia
So Fd=0.5xair thicknessxVxVxCdxA
I used 25 celsius thickness
Stock lupo GTI at 205 km/h= 0.5x1,184x56,9x56,9x0,34x2,00=1303
Lupo 2L at 266 km/h=0,5x1,184x72,2x72,2x0,375 (lupo 2L CdxA)=1157
GTI has 5 hp more but that will go to conquer higher frictions of the GTI than my lupo 2l.
Lupo 2L drag force @266 km/h should be lower than GTIs @ 205 km/h so what formula do you think I should use to get better results?
I get same power estimations with ecomodder fuel consumption calculator so I believe my calculations are correct.